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BUG: KCSAN: data-race in __lru_cache_add / lru_add_drain_all

write to 0xffff88812c029b60 of 1 bytes by task 7837 on cpu 0:
 pagevec_add include/linux/pagevec.h:81 [inline]
 __lru_cache_add+0xb8/0x1c0 mm/swap.c:410
 lru_cache_add mm/swap.c:447 [inline]
 lru_cache_add_active_or_unevictable+0xb0/0x1e0 mm/swap.c:477
 do_anonymous_page mm/memory.c:3225 [inline]
 handle_pte_fault mm/memory.c:4031 [inline]
 __handle_mm_fault+0x1b5d/0x2cf0 mm/memory.c:4163
 handle_mm_fault+0x21c/0x540 mm/memory.c:4200
 do_user_addr_fault arch/x86/mm/fault.c:1442 [inline]
 do_page_fault+0x4a4/0xa52 arch/x86/mm/fault.c:1517
 page_fault+0x34/0x40 arch/x86/entry/entry_64.S:1203

read to 0xffff88812c029b60 of 1 bytes by task 26020 on cpu 1:
 lru_add_drain_all+0x169/0x3a0 mm/swap.c:746
 memfd_wait_for_pins mm/memfd.c:82 [inline]
 memfd_add_seals mm/memfd.c:199 [inline]
 memfd_fcntl+0x732/0xd30 mm/memfd.c:231
 do_fcntl+0x157/0xa40 fs/fcntl.c:421
 __do_sys_fcntl fs/fcntl.c:463 [inline]
 __se_sys_fcntl fs/fcntl.c:448 [inline]
 __x64_sys_fcntl+0x107/0x150 fs/fcntl.c:448
 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 26020 Comm: syz-executor.1 Not tainted 5.6.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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